Anyone HEARD the Wyred 4 Sound STP-SE upgrades?

I've read nothing but praise for the base SE and nothing but the manufacturer's description about the upgrades. Several recent sales of the base model show an average of around $1300 for a good condition used one, which I may eventually buy, but I am nagged by the thought that a level 1 upgrade might make it a better fit in system even though it would probably only be available new for $2850. Has anyone out there actually heard one of the upgraded ones, and can comment on whether it would be worthwhile at more than double the cost of a gently used base model. My system is already quite revealing and the phono stage duties are handled quite nicely by a Thor TA-3000 and fed by a VPI SSM Ref. The amps are a pair of D-Sonic 600 W class D gems with acceptably close impedance to the preamp's output.